Mizz Halliday was involved in a bevy of projects throughout the past 2 decades, especially within the brief time Curve had supposedly broken up. Here's a list:

Faults[Acid Android]'03
So To Speak[DJ Acucrack]'00
Lola(vocal sample)[Headcase]'99-Dean Garcia side project.
Budded On Earth To Bloom In Heaven[Freaky Chakra]'95
Original[Leftfield]'95....great track!
Edge Of Life and Bloodline[Recoil]'92
Helen's Face[Syclla]'95(w/ Alan Moulder....from the Showgirls sdtrk). There is also "Get A Helmet" used in the film 'Nowhere' but the song does not appear on the soundtrack.
Cerebral[Future Sound Of London]'94(a not too apparent sample of her voice).

Hearts And Handshakes~Toni Halliday('88)....cheeZball solo attempt.
Balancing The Scales~State Of Play(Toni and Dean Garcia's first band together '86)
Shaken And Stirred('85)and Now & Zen('88)~Robert Plant(yup, of Led Zeppelin fame. She was a back-up vocalist on both those albums).
What's The Use Of Pretending EP~The Uncles(Toni's first band to release material '84)
The Smile And The Kiss[Bonk]'82...Toni as an extremely buried backing vocalist for that tune.